000K utf8 1100 2021$c2021-07-22 1500 eng 2050 urn:nbn:de:gbv:27-dbt-20210907-163525-002 2051 10.3390/molecules26154421 3000 Barreda, Ángela 3010 Albella, Pablo 3010 González, Francisco 3010 Moreno, Fernando 4000 Broadband Unidirectional Forward Scattering with High Refractive Index Nanostructures: Application in Solar Cells [Barreda, Ángela] 4060 13 Seiten 4209 High refractive index dielectric (HRID) nanoparticles are a clear alternative to metals in nanophotonic applications due to their low losses and directional scattering properties. It has been demonstrated that HRID dimers are more efficient scattering units than single nanoparticles in redirecting the incident radiation towards the forward direction. This effect was recently reported and is known as the “near zero-backward” scattering condition, attained when nanoparticles forming dimers strongly interact with each other. Here, we analyzed the electromagnetic response of HRID isolated nanoparticles and aggregates when deposited on monolayer and graded-index multilayer dielectric substrates. In particular, we studied the fraction of radiation that is scattered towards a substrate with known optical properties when the nanoparticles are located on its surface. We demonstrated that HRID dimers can increase the radiation emitted towards the substrate compared to that of isolated nanoparticles. However, this effect was only present for low values of the substrate refractive index. With the aim of observing the same effect for silicon substrates, we show that it is necessary to use a multilayer antireflection coating. We conclude that dimers of HRID nanoparticles on a graded-index multilayer substrate can increase the radiation scattered into a silicon photovoltaic wafer. The results in this work can be applied to the design of novel solar cells. 4950 https://doi.org/10.3390/molecules26154421$xR$3Volltext$534 4950 https://nbn-resolving.org/urn:nbn:de:gbv:27-dbt-20210907-163525-002$xR$3Volltext$534 4961 https://www.db-thueringen.de/receive/dbt_mods_00049445 5051 540 5550 high refractive index dielectric nanoparticles 5550 scattering directionality conditions 5550 solar cells